Control keyboard input into javafx TextField

Question

I want to control the input into a Javafx TextField so that I can allow only Numeric input, and so that if the max characters are exceeded, then no change will be made to th

Answer 1

Try this solution add this function in your controller , you must add it on the keyPressed Action of your text field.

@FXML
void verifnum(KeyEvent event) {

    txt.textProperty().addListener(new ChangeListener() {
        @Override
        public void changed(ObservableValue observable, String oldValue,
                String newValue) {
            if (!newValue.matches("\\d*")) {
                txt.setText(newValue.replaceAll("[^\\d]", ""));
            }
        }
    });
}